29 Time library [time]

29.8 The civil calendar [time.cal]

29.8.7 Class weekday_indexed [time.cal.wdidx]

29.8.7.1 Overview [time.cal.wdidx.overview]

namespace std::chrono { class weekday_indexed { chrono::weekday wd_; // exposition only unsigned char index_; // exposition only public: weekday_indexed() = default; constexpr weekday_indexed(const chrono::weekday& wd, unsigned index) noexcept; constexpr chrono::weekday weekday() const noexcept; constexpr unsigned index() const noexcept; constexpr bool ok() const noexcept; }; }

weekday_indexed represents a weekday and a small index in the range 1 to 5.

This class is used to represent the first, second, third, fourth, or fifth weekday of a month.

[Note 1:

A weekday_indexed object can be constructed by indexing a weekday with an unsigned.

— end note]

[Example 1: constexpr auto wdi = Sunday[2]; // wdi is the second Sunday of an as yet unspecified month static_assert(wdi.weekday() == Sunday); static_assert(wdi.index() == 2); — end example]

weekday_indexed is a trivially copyable and standard-layout class type.